This paper contains the Hadamard Transform in the SLM for the reduction of high peak to average power ratio (PAPR) in MIMOOFDM systems. In this technique, the input sequence is multiplied by a set of phase rotation vectors respectively and then applies the Hadamard Transform to the each resulting sequence based on SFBC. After that perform the Inverse Fast Fourier Transform in order to get the t...

To replace the film recording aspect of performing optical correlation, conventional real-time joint-transform correlation (JTC) optical systems make use of a spatial light modulator (SLM) located in the Fourier plane to record the joint-transform power spectrum (JPS) to achieve real-time processing. The use of an SLM in the Fourier plane, however, is a major drawback in these systems because S...

A spatial light modulator (SLM) and a pair of galvanometer-mounted mirrors (GMM) were combined into an optical tweezers setup. This provides great flexibility as the SLM creates an array of traps, which can be moved smoothly and quickly with the GMM. To optimize performance, the effect of the incidence angle on the SLM with respect to phase and intensity response was investigated. Although it i...

Communication is a key for facilitating multi-agent coordination on cooperative problems. In our previous work, we proposed Signal Learning (SL) and Signal Learning with Messages (SLM) by which agents learn local policies of communication and action simultaneously in MultiAgent Reinforcement Learning (MARL) framework. Our experimental results showed that both SL and SLM can improve the performa...

Additive manufacturing (AM) has emerged as a very promising technique for creating highly complex and customized solid structures on the basis of digital models. AM successively joins layers of material of different shapes to form a finished part Numerous variants of this technique have been proposed over the past years. One special additive manufacturing process able to produce load bearing pa...

STATEMENT OF PROBLEM Cobalt-chromium (Co-Cr) alloys have been widely used for metal-ceramic fixed prostheses and can be fabricated using conventionally cast or new computer-aided technology. However, the effect of different manufacturing methods on the metal-ceramic bond strength needs further evaluation. PURPOSE The purpose of this in vitro study was to evaluate the metal-ceramic bond streng...

The selective laser melting (SLM) of aluminium alloys is of great current interest at both the industrial and research levels. Aluminium poses a challenge to SLM compared with other candidate materials, such as titanium alloys, stainless steels, and nickel-based alloys, because of its high thermal diffusivity and low infrared absorptivity and tendency to result in relatively porous parts. Howev...

Copper alloys, combined with selective laser melting (SLM) technology, have attracted increasing attention in aerospace engineering, automobile, and medical fields. However, there are some difficulties in SLM forming owing to low laser absorption and excellent thermal conductivity. It is, therefore, necessary to explore a copper alloy in SLM. In this research, manufacturing feasibility and form...

Thepeak to avemgepwer ratio (PAPR) dishihtion of the @odic orihogonnlfi.quency division multiplexing (OFDM) dain symbol sequence is ewluated and it is shown t h a the OFDM data symbol sequence with short period is wpcted to have high PAPR. Using this result, we identr& the optimal phase sequence set and pmpse mws of a cyclic Hndamard mahu. comtrucfed by msequence as phase sequences for selected...

It is known that in the selected mapping (SLM) scheme for orthogonal frequency division multiplexing (OFDM), correlation (CORR) metric outperforms the peak-to-average power ratio (PAPR) metric in terms of bit error rate (BER) performance. It is also well known that four times oversampling is used for estimating the PAPR performance of continuous OFDM signal. In this paper, the oversampling effe...